Chemical evolution

Chemical evolution may refer to:
 * Abiogenesis, the transition from nonliving elements to living systems
 * Astrochemistry, the study of the abundance and reactions of molecules in the universe, and their interaction with radiation
 * Cosmochemistry, the study of the chemical compositions in the universe and the processes that led to them
 * Evolution of metal ions in biological systems, incorporation of metallic ions into living organisms and how it has changed over time
 * Gas evolution reaction, the process of a gas bubbling out from a solution
 * Molecular evolution, evolution at the scale of molecules
 * Oxygen evolution, the process of generating molecular oxygen through chemical reaction
 * Stellar nucleosynthesis, the creation of chemical elements by stellar thermonuclear fusion or supernovae